/Engine/Source/Developer/ToolWidgets/Public/Filters/SBasicFilterBar.h
Returns true if the specified filter is both checked (pinned on the filter bar) and active (contributing to filter the result).
bool IsFilterActive ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FFilterBase](API\Developer\ToolWidgets\Filters\FFilterBase)< FilterType >> & InFilter ) const